/*
 * 
 *  This file is part of Sourceprojects.org Lycia Copyright 2010 noctarius
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 * 
 */
package org.sourceprojects.lycia.internal.platform.base;

import org.sourceprojects.lycia.annotations.TextBody;
import org.sourceprojects.lycia.internal.platform.ElementContentExtractor;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class ElementContentExtractorImpl implements ElementContentExtractor {

	@Override
	public String getElementContent(final Element element,
			final TextBody textBody) {

		final StringBuilder sb = new StringBuilder();

		final boolean deepExtract = textBody != null && textBody.deep();

		final NodeList nodeList = element.getChildNodes();
		for (int i = 0; i < nodeList.getLength(); i++) {
			Node node = nodeList.item(i);

			if (node instanceof Element && deepExtract) {
				sb.append(getElementContent((Element) node, textBody));
			} else {
				sb.append(extractValue(node));
			}
		}

		String value = sb.toString();
		if (value.endsWith("\n")) {
			return value.substring(0, value.lastIndexOf("\n"));
		} else {
			return value;
		}
	}

	protected String extractValue(final Node node) {
		switch (node.getNodeType()) {
		case Node.CDATA_SECTION_NODE:
			return node.getNodeValue() + "\n";

		case Node.TEXT_NODE:
			return node.getNodeValue() + "\n";
		}

		return "";
	}

}
